52 Studies on Life-history of Bomhycine Moths. 



is crossed by fine impressed lines; there is a pale median line. The 

 2d and 3d thoracic segments are slightly wider than the prothoracic. 

 The abdominal segments gradually increase in width to the end of 

 the 8th segment. The skin is covered with coarse and dense granu- 

 lations, and in general is of a dark brown walnut-color, but paler 

 on the 2d and 3d thoracic and 1st and 2d abdominal segments, these 

 being dull flesh-colored, and faintly showing two parallel dorsal and 

 two wider subdorsal dark-brown stripes, which become obsolete on 

 the 3d and succeeding abdominal segments. The whitish granula- 

 tions are less dense on the 3d and succeeding segments than on the 

 front or striped portion, of the body. 



The terminal segments of the body are singularly modified ; when 

 retracted the body is thickest in the region of the 5th and Gth seg- 

 ments, but when extended to its full length the 8th abdominal seg- 

 ment is as wide as any ; the hind edge of this latter segment is 

 raised into a high, thick, pale flesh-colored fold, which takes the 

 place of the suture between the 8th and 9th segments. The 9th 

 segment is remarkably large and specially modified, having a sub- 

 lunate dorsal surface, and separated by a slight, sometimes well- 

 marked, ridge from the suranal plate; this ridge is not directly 

 transverse, but is composed of three curvilinear portions, a middle 

 and two lateral ones. The suranal plate is not quite so wide as 

 the 9th segment, but very large, broad, rounded, with the edge a 

 little thickened and the surface rapidly sloping downward and back- 

 ward; the surface of this (10th) and the 9th segment taken together 

 form an admirable and perfect stopper, or back door, closing the end 

 of the case. The skin on this portion is (evidently from frequent 

 use) dense and thickened, and further strengthened by the granula- 

 tions, which all over the 9th segment and the suranal plate are 

 densely crowded, extending on to the middle of the upper or dorsal 

 surface of the 8th segment. This portion of the 8th segment is 

 pale flesh-colored (without any rosy or pink tint) and is concolor- 

 ous with the pale hue of the 9th segment together with the lOtb, 

 or suranal plate. The impressed lines and punctures of this region 

 are more or less blackish. 



The body beneath on the anterior half is dark brown becomino- 

 paler behind. The thoracic legs are black; the abdoniiual ones of 

 the same color as the segments bearing them, with the addition of 

 a slight reddish tint and with a ehitinous light pitchy piece above 

 the plantae. On top of each thoracic segment are two dark minute 



